The vault doors to the abandoned government silo have just swung open as Evil Genius Online enters into open beta on Facebook. Developer Rebellion is accepting all evil masterminds for their free-to-play strategy.

The studio is hoping to "debunk a lot of myths" about Facebook as a platform for gaming, and their closed beta session targeted "fans of the 2004 Evil Genius PC game" rather than the casual hordes.

Independent UK game developer Rebellion has announced that it is developing a browser-based MMO based on the popular strategy game, Evil Genius Online. The developer also announced that registration to beta-test the game is now active.